Method of winding field coils



Nov. 4, '1941.

F. c. WILSON 2,261,200

METHOD OF WINDING FIELD COILS Filed June 15, 1940 Patented Nov. 4, 1941 UNITED STATES FATENT OFFICE 6 Claims.

This invention relates to a method of winding coils for the field of electric motors.

The present application in part is a continuation of the subject matter of my application Serial No. 308,080, filed December '7, 1939, for Core for and method of winding field coils.

It is aimed to provide a novel method whereby the coils wound may be of different and the desired size according to the motor, and a method whereby the coils are wound in connected, successive series from the smaller end of the cone, and are removed by movement of the series, accompanied by nesting thereof in the direction of the smaller end of the cone.

It is further aimed to provide a method whereby the coils are wound in successive connected series with the series consisting of cylinders of a single layer, so that whether the cylinders aretapered or otherwise, they may be collapsed temporarily to dispose the coils approximately in fiat or planar condition for easier, safer and more expeditious insertion, such feature being especially advantageous in connection with coils of three phase windings.

The more specific objects and advantages will become apparent from a consideration of the description following taken in connection with accompanying drawing illustrating an operative embodiment.

In said drawing:

Figure l is a view in elevation showing mechanism in connection with which the process or method is practiced;

Figure 2 is a cross sectional view taken on the plane of line 2-2 of Figure 1;

Figure 3 is a plan view of one of the coil engaging clips or clamps which may be used, and

Figure 4 is a longitudinal section taken on the plane of line 4-4 of Figure 3.

Referring specifically to the drawing wherein like reference characters designate ilke or similar parts throughout the different views, the core in connection with which my method may be practiced, for example, consists of two parallel sections which are similar in construction and collectively form substantially a cone in that the outer surfaces thereof are at all points arouate in cross section and tapered as shown. Such sections ID are hollow throughout most of their length, being open at their inner faces and along their longitudinal edges are grooved and flattened and provided with measurement marks or calibrations as at H.

Said cone sections during winding operatation of a head H. which is connected to'the shaft of an electric motor, for example, or otherwise rotated. Such head l2 has a plate or bar l3 removably bolted thereto as at I4. Plate l3 has a central bearing IS in which a shaft or rod I6 is journaled. At opposite ends, said shaft i6 is screw threaded in opposite directions as at I9 and engaged with fixed nuts 20 on brackets 21 slidably mounted on the bar or plate I3.

The core sections H1 at their larger ends are reduced to form attaching shanks 22 through which shaft [0 passes. In addition, removable bolts 24 detachably secure the core sections [0 to the brackets, the same passing through the shanks 22, as shown. Knurled knobs or the like 25 are provided at opposite ends of the shaft l6, either of which may be operated to rotate the shaft 16 and according to the direction of rotation, move the core sections l0 closer to gether or wider apart.

In winding coils for motor fields, metallic wire 26 is supplied from the smaller end of the cone or sections and wound about the same toward the larger end of the core and first in a series of contacting coils 21 forming a layer. The wire is then spread by one or more separated coils 28 and then wound into a layer of contacting coils at a group 29, thenthe wire is spread again at one or more coils 30 and finally wound into a group or layer of contacting coils 3|. Rotation of the core is then stopped and suitable clips or clamps 32, as detailed in Figures 3 and 4, are applied about the groups 21, 29 and 3| to prevent the groups of coils from springing out, twisting and tangling. Such clips or clamps 32 may be of any suitable form, for instance like that disclosed in my said pending application but I prefer to use the form herein disclosed which consists of a pair of metallic bars 33 which are connected together at one end by a bolt 34, with a spring ring 35 disposed between them and surrounding the bolt and tending to expand the bars. At the opposite end, such bars preferably have notches 36, which accommodate another bolt 3'1. The bolts 34 and 31 may have their nuts tightened to any desired degree to hold the coils properly assembled.

Following the winding operation mentioned, the wound structure is removed from the core sections as follows. First, the group 3| is pulled toward the smaller end of the cone sections and over the group 29, thereby becoming nested in and concentric with the group 3!, and theretions are adapted to be rotated through the r0- 5: after, the nested gro ps 29 and 3| are jointly pulled toward the smaller ends of the core sections and incidental to which the group 29 is moved over the group 21, the latter being nested within the group 29 concentric therewith and with the group 3i, and thereafter all of the groups as a nested unit are removed from the core sections so that such groups may be wound into the usual motor slots to form the field coils of the motor, the winding in the slots starting at the smaller end of the group 21 and being wound in the motor slots one coil at a time, it being understood that the clips 32 are removed one at a time as winding proceeds.

It will be understood that the core sections [0 may be made in any desired size and dimensions according to the motor or work wherein the windings are to be used, and that the measurements or calibrations I I may vary, as preferred, and that they serve as gages in winding, in order to provide the groups of the desired diameter, numbers of coils according to the motor, and the distances apart at which the winding groups should start and end.

Attention is called to the fact that in some instances, that the sections 10 will not be tapered but have their outer longitudinal edges in parallelism so that the groups coiled thereon will have their coils all of the same diameter, it being clear that the windings may consist of any desired number of the groups. This is especially desirable when the coils are prepared for three phase windings. Also, any desired number of the clips or clamps 32 may be used on each group of coils.

The winding, according to my invention, of

the coils of the groups in a single layer, is highly advantageous even where all of the coils are of the same diameter, since the clamps or clips enable such groups to be temporarily flattened or rendered approximately planar, to facilitate insertion into the motor and one through the other.

Various changes may be resorted to, provided they fall within the spirit and scope of the invention.

I claim as my invention:

1. The method consisting in winding a wire to provide coils for a motor field, in successive groups of coils on a tapered body in the direction toward the larger end of such body, and in stripping the winding by moving the innermost group of coils in the direction away from said larger end over a group of coils of less diameter, and continuing the movement in the same direction with all groups of coils in nested relation.

2. The method consisting in winding an element in successive groups of coils on a tapered body in the direction toward the larger end of such body, and in stripping the winding by moving the innermost group of coils in the direction away from said larger end over a group of coils of less diameter, and continuing the movement in the same direction with all groups of coils in nested relation.

3. The method consisting in winding an element in successive groups of coils, the coils of each group being in a single layer and connected together whereby the groups may be temporarily collapsed from cylindrical to approximately planar condition to facilitate application to the motor.

4. The method consisting in winding an element in successive groups of coils, the groups being connected together and having the coils arranged in a thickness enabling temporary collapse from cylindrical to approximately flat condition to facilitate application to the motor.

5. The method consisting in winding an element in successive groups of coils, the coils of each group being in a single layer and connected together whereby the groups may be temporarily collapsed from cylindrical to approximately planar condition to facilitate application to the motor, and in clamping the coils of each group together before application to the motor in a. manner permitting the said temporary collapse.

6. The method consisting in winding an element in successive groups of coils, the groups being connected together and having the coils arranged in a thickness enabling temporary collapse from cylindrical to approximately flat condition to facilitate application to the motor, and in clamping the coils of each group together before application to the motor in a manner permitting the said temporary collapse.

FLETCHER C. WILSON. 

